Merge branch 'mt/rot13-in-c'

Test portability improvements.

* mt/rot13-in-c:
  tests: use the new C rot13-filter helper to avoid PERL prereq
  t0021: implementation the rot13-filter.pl script in C
  t0021: avoid grepping for a Perl-specific string at filter output

Author: gitster

Makefile

@@ -772,6 +772,7 @@ TEST_BUILTINS_OBJS += test-read-midx.o
 TEST_BUILTINS_OBJS += test-ref-store.o
 TEST_BUILTINS_OBJS += test-reftable.o
 TEST_BUILTINS_OBJS += test-regex.o
+TEST_BUILTINS_OBJS += test-rot13-filter.o
 TEST_BUILTINS_OBJS += test-repository.o
 TEST_BUILTINS_OBJS += test-revision-walking.o
 TEST_BUILTINS_OBJS += test-run-command.o

pkt-line.c

@@ -309,7 +309,8 @@ int write_packetized_from_fd_no_flush(int fd_in, int fd_out)
 	return err;
 }
 
-int write_packetized_from_buf_no_flush(const char *src_in, size_t len, int fd_out)
+int write_packetized_from_buf_no_flush_count(const char *src_in, size_t len,
+					     int fd_out, int *packet_counter)
 {
 	int err = 0;
 	size_t bytes_written = 0;
@@ -324,6 +325,8 @@ int write_packetized_from_buf_no_flush(const char *src_in, size_t len, int fd_ou
 			break;
 		err = packet_write_gently(fd_out, src_in + bytes_written, bytes_to_write);
 		bytes_written += bytes_to_write;
+		if (packet_counter)
+			(*packet_counter)++;
 	}
 	return err;
 }

pkt-line.h

@@ -32,7 +32,13 @@ void packet_buf_write(struct strbuf *buf, const char *fmt, ...) __attribute__((f
 int packet_flush_gently(int fd);
 int packet_write_fmt_gently(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
 int write_packetized_from_fd_no_flush(int fd_in, int fd_out);
-int write_packetized_from_buf_no_flush(const char *src_in, size_t len, int fd_out);
+int write_packetized_from_buf_no_flush_count(const char *src_in, size_t len,
+					     int fd_out, int *packet_counter);
+static inline int write_packetized_from_buf_no_flush(const char *src_in,
+						     size_t len, int fd_out)
+{
+	return write_packetized_from_buf_no_flush_count(src_in, len, fd_out, NULL);
+}
 
 /*
  * Stdio versions of packet_write functions. When mixing these with fd